Let-off mechanism for looms.



W. J. LUTTON. LET-OFF MECHANISM FOR LOOMS. APPLICATION FILED 11110.19, 1911.

Patented July 28, 1914.

3 SHBETSSHEET 1.

W. J. LUTTON.

LET-OFF MECHANISM FOR LOOMS.

APPLIUATION EILED DEG. 19. 1911.

Patented July 28, 1914.

3 SHEETS-SHEET 2.

W Q Q I 122245116 7'. Q $757M W. J. LUTTON.

LET-OFF MECHANISM FOR Looms.

- APPLICATION FILED 11110.19, 1911. 1,105,335. Patented July 28, 1914.

3 SHEETS-SHEET 3.

WILLIAM JL LUTTON, OF PATERSON, NEW JERSEY.

LET-OFF MECHANISM FOR LOOMS.

Specification of Letters Ilatent.

Patented July 28, 1914.

Application filed December 19, 1911. serial No. 666,793.

To all whom it may concern:

Be it known that '1, WILLIAM J. LUTTON, a citizen of the United 'States, and resident of Paterson, in the county of Passaic and State useful Let-01f Mechanism for Looms, of which the following is a specification.

My invention relates to let-off mechanism for looms, with the object in view of providing means for automatically maintainin a uniformstress on the warp threadsas hey are let off step by step from the 'warp beam.

In the accompanying drawings, Figure 1 is a vertical section, partly in side elevation,

in the plane of the line AA, Fig. 2, of so much of a loom as will suffice to show the practical application of my invention. Fig.

2 is an end view broken away through the center, Fig. 3 is an enlarged partial horizontal section in the plane of the line BB,

Fig. 1, Fig. 4 is an enlarged partial vertical section in the plane in which Fig. 1 is taken,

showing in full lines the position which the parts assume when the warp beam is about to be released to let off warp, and in dot-ted lines't-he position in which the trip bar. is

held while the pawl which releases the warp beam is operated, Fig. 5 is a view .in detail in elevation showing the weight retaining 80 device -in operative position, Fig. 6 is a View of the same in vertical sectionfFig. 7 is a view taken in a plane corresponding to that in which Fig.1 is taken and showinga modi 85 horizontal view in the plane. of the line CC of Fig. 7, and Fig. 9 is an enlarged 'view in detail, in side elevation, showin the action of the modified mechanism for li ting and maintaining the trip 'barin raised p0 sition while the pawl releases the warp beam. The loom frame is denoted by 1 and may be of any well known or approved construction. The vibrating arm for operating the layis denoted by 2, the crank shaft for transmit 4 ting motion to it by 3, and the'link' connecting the crank shaft with the arm by 4. The

.war beam, denoted by 5, is mounted on a rotation by a pawl 38, pivoted to the frame 8'at 39, the tail of the pawl extending downwardly a considerable distance and having sha t 6, supportedin suitable bearings carried by the bracket frame 8-fixe'd t0 the loom frame 1. Fixed to rotate with the warp beam'is abrake drum 9 and aratchet toothed wheel, 10. A band brake vlll-is secured at one end tothe frame v8 at12 and after passin around the brake drum 9, the

opposite en of the brakeis attached to a bolt 13, the threaded end of which extends docked to, the standards by through a hole in a stud 14 projecting from the frame 8 and is provided with a wing nut T 15 for tightening the brake 11 on the drum 9' at pleasure. of New Jersey, have invented a new and 1 A'warp guide roller 16 is mounted on a shaft 17 carriedby uprights 18, 19, fixed to -the frame 8, and a weighted floating roller 20 is suspended by the Warp threads in their passage from the warp beam 5 to the guide roller 16. The floating spindle 21 on which i the floating roller 20 turns is provided with depending links 22,23, which support a bar 3 24 on which a series of weights 25 are threaded, the number of weights depending upon the stress which it is desired to place upon the warp threads. The links 22, 23, are provided with loops 26,, 27, which embrace the bar 24, and the opposite ends of the bar are projected througlr elongated vertical slots .8, 29, in standards 30, 31, preferably extending from the floor up to the lower part of the frame 8, to which they are secured.

The ends of the. bar 24,. which project through the said elongated slots, are conveniently held in the slots by cotter pins 32, 33, while they are fitted to slide freely up and down within the slots.- Either end of "the bar 24 may bewithdrawn from the slot by removing the cotter and sliding the bar endwise through the suspension loops 26, 27, and through the opposite slot,-whenever it {is desired to remove or add one. or more p V weights fication of certaln parts, Fig. 8 1s a partial I The weight bar with weights thereon may be sustained at any time in the desired elevated position, independently of the warp threads by. means of blocks 34,. 35., provided with" bolts 36 (see Fig. 6) which extend through the slots 28, 29,'and have tail nuts 37, engaged therewith and with the standards on'the opposite sides of the slots, whereby the blocks may be slid upward into touch with the bar 24 or to such a height as it may be desired to sustain the bar, and then screwing up the tail nuts. a I

The warp beam is held against unintentional connected therewith a. spring 40 for holding fit in engagement with the ratchet toothedv wheel 10.. The pawl 38 is released from thewheel 10 and the warp beam allowed to ro.-;

tate a step by the rise of the floating, roller 20 and its weight as the warp threads 41 are engaged the tail of the pawl 38 and tripped- 42 and its lower end rests lightly on oris lo-' cated in proximity to a shelf 44 along which the said finger slides back and forth as the I bar 42 is reciprocated. The weight of the finger end of the bar 42 is for the most part or entirely taken by a bracket 45 on the tail of the pawl 38 (see Fig. 3). The finger 43 is caused to assume a folded position, as shown in Fig. 1, by a spring 46 connected at one endto the bar 42 and at its opposite end to the finger 43 by means of a bent connecting rod 47. A stop 48 on the bar 42 limits the folding movement of the finger, holding it, when in its folded adjustment, preferably at an angle of about 45 to the bar 42.

Attached to the weight bar 24'is a catch '49, in the present instance an L-shaped catch, the end of which is in position to rise in close proximity to the outer end of the shelf 44 as the floating roller 20 and its weight rise, so that when the end of the catch projects above the end of the shelf, as shown in Fig. 4, the end of the finger 43, as the bar 42 moves to the right, as the drawing is held, will engage the catch and be rocked into a position at right angles to the bar 42, as shown in full lines, Fig. 4, thereby lifting the bar 42 so that a lateral projection 50 thereon will ride up an incline 51, as the bar 42 moves in the opposite direction, raising the bar into the position shown in dotted lines, Fig. 4, and maintaining it in a raised position until a projection 52. on the bar has the pawl. As soon as this has been accomweight allowed to drop by the turning of the warp beam, the projection 50 will drop through a recess 53 in the edge of the incline permitting the bar 42 to dro onto the position to again operate the bar when the As the bar 42 is thrown upward by the finger-43 on its stroke to the right to lift the projection 50 into position to ride u the incline 51, the possib e engagement 0 the projection 50 with the incline on this stroke is provided for by mounting the incline in rocln'ng adjustment on a standard 54 attached to the frame 1, the said inclinebeing held in normal position by a spring 55 which ermits the incline to tilt to allow the proection 50 to pass.. A stop 56 prevents the incline from tilting in the tion.

In the modified form shown inFigs. 7

opposite dire cwith the bar.

'ing will gradually lift the to 9 inclusive the incline for lifting the pawl tripping bar is fixed in position and the projection on the bar is yieldingly connected In this, form too, the bar raising finger is dispensed with and the bar is supported". by a bracket secured to the frame 1. The modified pawl tripping bar is denoted by 57, its supporting bracket by 58, and the projection carried thereby for engaging the tail of the pawl by 52, as this,

in form and position, is the same as has heretofore been explained, and until the bar 57 is lifted reciprocates in and out of a recess 59 in the tail of the pawl 38. The incline is denoted by 60 and is fixed at one end to the frame 1 and supported by the standard 61. The incline has a recess 62 in its edge for allowing thebar raising projection todrop through. The bar raising projection is denoted by 63 and is on a tilting piece 64 pivoted to an upward extension 65 on the bar 57 and held yieldingly against a stop 66 by a spring 67. A stop 68 limits the tilt of the piece 64. The free end of the bar 57 lies in the path of the weight bar 24 and as the latter rises it gradually lifts the bar 57 until the projec tioif 63 reaches a height where it will ride up the incline 60 and thereby raise the projection 52 above the recess 59 and cause it to engage the tail of the pawl and trip it.

In operation, the warp beam having by its brake band been placed under such restraint as found desirable for letting off the warp when released, and the desired tension having been applied by giving the floating roller 20 the necessary wei ht, the weavoating roller and its weight as the warp is taken up, until the bar 42 or 57 is liftedby the action of the rising weight bar bringing the inclined 1 plane into action to further lift and mainplished, and the floating roller 20 andw its tain lifted for a short period of time the said bar to cause its projection 52 to engage the tail of thepawl 38 above the recess 59 and thereby trip the pawl and allow the warp beam to rotate a step to let off warp. racket 45 with its finger 43 f0 ded and in i It will beobserved thatat no time is the tension on the warp varied as the weighted catch 49 shall again rise into position to en roller 20 is resting thereon both when the .warp beam is held against rotation and .when it is allowed to rotate and furthermore, any stretching of the threads may take place without in any degree varying the tension.

What I claim is 1. In a loom, a warp beam, a pawl and ratchet for holding the warp beam against rotation, a floating roller for applying stress to the warp threads, a reciprocating bar having its free end in position to be lifted during the-rise of the floating roller, and means adapted to (meet with the. reciprocating bar to cause it to riseduring the rise of the floating roller, the said reciprocating 1;

bar being provided with means for engaging and tripping the pawl when the floating roller reaches apredetermined height.

2. In a loom, a Warp beam, a ratchet and pawl for holding the warp beam against 3. In a loom,.a war beam, a ratchet wheel and pawl for holdlng the war beam against rotation, a weighted roller or applying stress .to the, warp threads, a catch connected to rise and fall with the weighted roller, a reciprocating bar provided with a projection for engaging and tripping the pawl, and a spring actuated finger pivoted to the reciprocating bar and adapted to engage the said catch when the latter reaches a .predetermined height whereby the reciprocating bar may be lifted and the pawl tripped.

4. In a loom, a warp beam, a pawl and ratchet for'holding the warp beam against rotation, a floating weighted roller for applying stress to the warp threads, a recipro eating bar, means coliperating therewith to lift the bar when the weighted floating roller reaches a predetermined height, the

' said bar being provided with a projection in position to engage and trip the pawl,an inclined plane and a projection carried by the bar in position to ride up the inclined plane when the bar is lifted and thereby furmomentarily raised. 1

5. In a loom, a warpbeam, means; for

holding it against rotation, a floating roller for applying stress to the warp threads, a rec procating bar, means coacti'ng with the reciprocating bar and floating roller for liftmg the bar when the roller reaches a predetermlned height and thereby temporarily release the warp beam holding means, an inchned plane and a projection carried by the reciprocating .bar in position to ride up the inclined lanewhen the bar is lifted and thereby urther raise and maintain the reclprocating bar momentarily in a raised position.

6. In a loom, a warp beam, means for apv plying stress to the warp threads tending to rotate the warp beam, a pawl and ratchet for holding the warp beam against rotation,

a reciprocating bar, means'cooperating with the bar and said stress applying means to lift/the bar, an inclined plane and a projection carried by the reciprocating bar in position to engage the inclined lane when the bar is lifted, the said incline plane and the said projection having a yielding movement on'e relative to the other.

7. In. a loom, a warp beam, means for applying stress to the warp threads tendm to rotate the warp beam, a pawl and rate et for holding the warp beam against rotatlon, a reciprocating bar, means cooperating Wllih' the bar and the st ess applying means for lifting the bar, the said bar being provided with a projection in position to engage and trip the pawl when the bar reaches a predetermined height, a spring actuated inclined plane provided with a recess in Its s1 de and a projection carried by the reciprocatmgbar in position to ride up the inclined plane when the bar is raised and drop through the for applying stress to the warp threads, a

weight 'bar. suspended from the vfloating roller, slotted guides for recelvmg the opposite ends of the weight bar, means under the control of the floating roller and its weight bar for temporarily releasing the warp beam and adjustable supports arranged to coact with the slotted guides for holding theweight bar temporarily in an elevated pos1- tion. l

9. In a loom, a warp beam, an adjustable brake band for applying friction to reslst the rotation of the warp beam, a ratchet wheel fixed to rotate with the warp beam, a sprin actuated pawl arranged to coiiperate with the ratchet wheel-and provided wlth a recess in its tail, a floating roller for applying stress to the warp threads, a reclproeating bar, means cooperatlng w1th the floating roller and bar or ralsing the bar into position to operate the pawl, the saidreciprocating bar havrng a pro ection thereon adapted to move mto and out of the reces -in the tail of the pawl when the reciproca ing bar is in its non-operatlve position and an inclined plane arranged to cooperate with the reciprocating bar when the latter has been raised to a height by the floating roller.

In testimony, that Iv learn as my invention, I have slgned my name in presence of two witnesses, this fourteenth day of December, 1911. v p 7 WILLIAM J. LUTTON. Witnesses: .1

'THOMAS .W. RANDALL, CHARLES F. MonrHEAD.

predetermined the foregoing 

